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Deep cryogenic regenerator using helium as heat recovery medium and its pulse tube refrigerator

A technology of pulse tube refrigerators and regenerators, which is applied in the direction of refrigerators, superheaters, refrigeration components, etc., can solve the problems that affect the cooling efficiency of regenerators and pulse tube refrigerators, and the specific heat capacity will decrease, so as to achieve high-efficiency heat exchange , improve performance, high efficiency effect

Active Publication Date: 2016-11-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But as mentioned above, at deep low temperature (<10K), the specific heat capacity of the regenerator material will drop significantly, which will greatly affect the cooling efficiency of the regenerator and pulse tube refrigerator.

Method used

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  • Deep cryogenic regenerator using helium as heat recovery medium and its pulse tube refrigerator
  • Deep cryogenic regenerator using helium as heat recovery medium and its pulse tube refrigerator
  • Deep cryogenic regenerator using helium as heat recovery medium and its pulse tube refrigerator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] like Figure 1a and Figure 1b Shown: a deep low temperature regenerator He-Re using helium as the heat recovery medium includes: a tube shell SC with a hot end flow hole 1 and a cold end flow hole 2, and a return tube placed in the tube shell SC The hot filler and the regenerative filler have a gas flow channel FC connecting the hot end flow hole 1 and the cold end flow hole 2, and the regenerative filler is a sealed heat exchange structure filled with helium. The shell SC is a stainless steel tube.

[0041] The sealed heat exchange structure includes: an upper end cover UC, a lower end cover DC, and several groups of heat exchange tubes T fixed between the upper end cover UC and the lower end cover DC for filling helium. The heat exchange tube T is a copper tube. Each set of heat exchange tubes T is arranged in a ring shape; multiple sets of ring heat exchange tubes T are arranged concentrically. Between two adjacent sets of heat exchange tubes T is a gas flow cha...

Embodiment 2

[0046] like figure 2 As shown, a two-stage low-frequency pulse tube refrigerator using helium as the heat recovery medium for a deep low-temperature regenerator includes: a first-stage compressor C1, a first-stage aftercooler AC1, a first-stage compressor Low-pressure control valve LV1, first-stage compressor high-pressure control valve HV1, first-stage regenerator RG1, first-stage cold-end heat exchanger HX2, first-stage pulse tube PT1, first-stage pulse tube hot-end heat exchanger The first-stage precooling pulse tube refrigerator unit composed of HX3, the first-stage two-way intake valve DO1, the first-stage orifice valve O1, and the first-stage gas storage R1, the thermal bridge TB, and the second-stage compressor C2 , The second-stage aftercooler AC2, the second-stage compressor low-pressure control valve LV2, the second-stage compressor high-pressure control valve HV2, the second-stage pre-cooling section regenerator RG21, the second-stage pre-cooling section regenerato...

Embodiment 3

[0056] like image 3 As shown, a high-frequency pulse tube refrigerator using helium as the heat recovery medium for a deep-low temperature regenerator includes a first-stage compressor C1, a first-stage regenerator hot-end heat exchanger HX1, a first-stage Regenerator RG1, first-stage cold-end heat exchanger HX2, first-stage pulse tube PT1, first-stage pulse tube hot-end heat exchanger HX3, first-stage inertial tube I1, first-stage gas storage R1 The first-stage pre-cooling pulse tube refrigerator unit, the first-stage thermal bridge TB1, consists of the second-stage compressor C2, the second-stage regenerator hot-end heat exchanger HX4, the second-stage pre-cooling section regenerator RG21, the second-stage regenerator Secondary pre-cooling section regenerator cold end heat exchanger HX5, second stage low temperature section regenerator RG23, second stage cold end heat exchanger HX6, second stage pulse tube PT2, second stage pulse tube hot end exchanger The second-stage pre...

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Abstract

The invention discloses a deep hypothermic heat regenerator adopting helium as a heat regeneration medium. The heat regenerator comprises a tube shell and heat regeneration padding arranged in the tube shell. The heat regeneration padding is of a sealed heat exchange structure filled with the helium. The invention further discloses a pulse tube refrigerator adopting the deep hypothermic heat regenerator. According to the pulse tube refrigerator, the characteristic that the helium is high in volumetric specific heat capacity at low temperature is utilized, and the helium is closed in a certain space and used as the heat regeneration medium to exchange heat with helium used as a refrigerating working medium; the helium with the suitable pressure can be selected and charged into the enclosed space according to the work pressure of the pulse tube refrigerator so that the volumetric specific heat capacity of the helium serving as the heat regeneration medium in the deep hypothermic area can be higher than that of the helium serving as the refrigerating working medium, efficient heat regeneration can be achieved, and finally the performance of the pulse tube refrigerator in the liquid helium temperature area can be improved; meanwhile, compared with a magnetic heat regeneration material, the deep hypothermic heat regenerator adopting the helium as the heat regeneration medium has the advantages of being low in price, easy to obtain, free from influence of a magnetic field and the like.

Description

technical field [0001] The invention relates to a regenerative low-temperature refrigerator, in particular to a deep-low temperature regenerator using helium gas as a regenerating medium and a pulse tube refrigerator thereof. Background technique [0002] The liquid helium temperature zone plays an indispensable and important role in the fields of national defense, military, energy, medical, aerospace, low temperature physics and so on. Since the Dutch physicist Kamerlingh.Onnes first realized the liquefaction of helium in 1908, the liquid helium temperature zone (4K) has been the focus and difficulty of the research in the field of cryogenic engineering. At the same time, especially since the 1980s, human beings have higher technical and performance requirements for cryogenic refrigeration technology, and more and more stringent requirements have been put forward for the efficiency, reliability, volume, weight, and vibration of cryogenic refrigerators. Require. [0003] T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B40/06F25B9/14
Inventor 王博甘智华尹成厚马仁飞
Owner ZHEJIANG UNIV
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